Questions tagged [high-current]
Say how much current is required, high-current means different things to different people.
241
questions
1
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2answers
125 views
Can single phase AC produce a continuous electric arc?
Constant DC supply and 3 phase AC (in mercury rectifier) can produce a continuous arc. But can single phase AC also produce a continuous arc? Because it is written on the web that arc extinguishes at ...
0
votes
0answers
67 views
Oscilloscope high voltage and current measurements
I have been tasked with measuring both the voltage and current output of a plasma system but have only been provided and oscilloscope to do this (Tektonix TBS 2000 Series 100MHz, 1G/s) and a high ...
0
votes
1answer
85 views
Supercapacitor based lightning-harvester [closed]
Could lightning discharges be harvested and stored in supercapacitor banks? Could supercapacitors withstand and collect lightning?
Lightning usually lasts for about 10 micro seconds and reaches ...
1
vote
0answers
50 views
Standards for colour of conductors of pre-assembled cables
We are designing a product for industrial energy storage systems. Multiple units are connected with pre-fabricated cable assemblies of 2-4 separate leads that are terminated in connectors unique to ...
3
votes
1answer
86 views
How to design a contactless mechanical shaker [closed]
I am trying to design a circuit to make an inductor oscillate with high-current (around 50A) at a low frequency. The inductor will act as a high-powered electromagnet.
Most designs I've worked/messed ...
0
votes
2answers
64 views
High current on PCB to through hole connector
If I have a though-hole connector with 3.5mm pin spacing and the manufacture rates it for 14 amps per contact, how am I supposed to safely carry anywhere near that current over the PCB? Specifically, ...
1
vote
0answers
46 views
What capacitor to use for high voltage & high current filter application
I am designing a filter that needs a capacitor. I am not allowed to paste the schematic here, so only the maximum voltage at and current through the cap, pasted from the spice simulation:
(voltage is ...
1
vote
0answers
62 views
Proper capacitors for ESP8266-12F?, resetting at high current peak
When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
0
votes
3answers
131 views
2000A current sensing using STM32
Is there any chance to read 2000A using STM32? I searched the Internet for low-value shunt resistor but nothing found. maybe some kind of current transformer could do the job!!
any help will be ...
0
votes
0answers
109 views
Safe Voltage/Amperage for Soldered Wires - aka When to Crimp Instead
I have found a lot of information that circles around what I'm looking for, but nothing that directly answers it. It is possible there is no right answer.
I am jealous of the Macbook ...
-6
votes
2answers
120 views
Which resistors to use for high current (10A) voltage-divider? [closed]
I'm having a problem determining resistor specs (especially wattage) for my voltage divider circuit [ 27 V to 17.5 \$+-\$ 0.5 V ] on 10 ampere DC supply.
I have an AC (220V 50Hz) to DC (27V 10A) ...
0
votes
1answer
76 views
How to safely limit current for DC12v 30a?
I am plating my vias with electrolysis, and I need to safely limit the current so it doesn't go over 30 amps.
The power supply I'm going to order is, you guessed it, 12V 30A.
I've calculated the ...
0
votes
2answers
54 views
Multiplexing high current connections?
Noob question here.
Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm ...
2
votes
0answers
42 views
Suggestions solutions for high current bed of nails style testing [closed]
I'm trying to create a tester board that will hold some power path components (DC input caps, IGBTs, current sensors) that are normally on the Unit Under Test (UUT).
I'd like to connect these ...
0
votes
2answers
42 views
Sizing cables in pulsed power applications
I am looking for rules for sizing cables for short pulses. For example, if I were to run 2000A DC current for 0.5 seconds in a cable, what size would I need? Sizing as if it were continuous current ...
1
vote
1answer
85 views
High voltage and current
I have a DC motor that needs and works nearly 400v and 20A. I chose FDL100N50 for n-channel mosfet also IXTK40P50P for p-channel mosfet.
I connect a 4n35 optocupler for output of every mosfet.
Are ...
1
vote
2answers
105 views
Joining high current wires outdoors
I am conducting an experiment where I would like to heat up 18 AWG copper cables outdoors using to 50-60°C using 60 amps. The wires are wrapped with teflon to prevent damage to the cable. Can I use a ...
7
votes
1answer
806 views
Series pass transistor, LM7812
I am making a 12 volt regulator for a solar panel to power an audio amplifier. I already have a switching regulator for most application but it is very noisy for amplifier even with a lot of filtering....
0
votes
0answers
33 views
Shorting the output of both the channels of L298N
Suppose I started with a project requiring the control of motors and ended with using L298N in my project, realizing that my motor only takes around 1.5A when on load.
Now, with time I realized that ...
2
votes
1answer
146 views
High current, low voltage capacitors
I'm putting together a high current (200A+), low voltage (<5v) rectifier circuit.
I have sufficient bridge rectifiers, but to smooth out the waveform I need a strong enough capacitor bank. Besides ...
0
votes
1answer
99 views
Stabilize circuit on 5V 2A
I have not yet build following circuit:
Circuit in high performance needs 5V 1.7A (measured). I have source which is powerbank with 16 000 mAh. Outputting via ports: USB-C 5V/3A, USB-A 5V/3A, Micro-...
0
votes
1answer
137 views
Sizing a trace on a PCB to carry 50 amps
Currently working on a 4 layer pcb-card where I need to trace for 50 amps, any ideas how I can design it?
Any tips would be appreciated. Thanks!
1
vote
0answers
69 views
Electric heating for glass melting furnace
Some furnaces use electricity for glass melting. Low voltage and high amperage power is passed through the molten glass through 2 molybednum electrodes dipped into the glass. The molten glass acts as ...
2
votes
1answer
156 views
How to generate a high energy electromagnetic wave? Using high voltage or high current?
I am about generating an electromagnetic wave which should be powerful enough. So I should manipulate its electric field and magnetic field simultaneously. As far as I know E amplitude depends on the ...
0
votes
0answers
104 views
How to line a Metal Melter secondary for higher safety
A Metal Melter is a kind of home-made low voltage (less than 40 volts, mine is 3v) welder (small-scale) made from a microwave oven transformer (MOT). I left the primary intact (the thicker wire, which ...
1
vote
1answer
157 views
Switching high voltages with MOSFET at high frequencies
I need to rectify 220V 50Hz AC power to obtain 48V DC output voltage. Up to 40A current can be drawn from the DC side. 10% ripple is acceptable on the rectified voltage.
I am considering two ...
0
votes
1answer
48 views
How to control a lightbar with 20 individual modules? [closed]
The TL;DR version of my question is, how do you control 20 pieces of 12V/1A outputs in the most reliable, compact and cost efficient way, with something programmable?
The long version:
I got a ...
0
votes
4answers
230 views
Too High Voltage Drop across Transformer's Output
I want to get very high current flow thought secondary winding of transformer on my 3 Ohm load. As I apply high voltage of secondary to the load the voltage across it drops dramatically. Only about 2% ...
11
votes
7answers
2k views
How can the ACS712 pin handle 20 A?
I am searching for some current measuring ICs and found the ACS712, but what I can't figure out is how the seemingly small pins can handle the 20 A current since the trace width calculators say that I ...
0
votes
0answers
80 views
4 Layer board with high current return path inner layer
So I am doing a layout for a 4 layer PCB 1 ounce/layer. The Chip supports up to 20A (motor controller driver). The application needs about 12 amps max ( I plan it let it go up to 17A in the event of ...
0
votes
1answer
92 views
Specifying parts for Induction Heater; how to determine current requirements at transformer? [closed]
I'm working on specifying parts for the following circuit:
I intend to have a very large work coil, (like 12" diameter) so I'm expecting to need a lot of power. I'm on a tight budget, though, so ...
1
vote
2answers
199 views
IGBT destroyed. Help me identify any potential problems
I am trying to build an inductive oven control (for temperatures up to 1500 C), that controls the temperature by turning on the the inductive oven on and off like a commercial inductive hotplate.
...
1
vote
0answers
392 views
Pulsed DC, kA range inductive transient protection method
I would like to design a transient protection solution for HVDC_pulse_unit.
HVDC voltage = 3500V , current > 40kA.
Events:
D1 flyback diode survives(50kA surge forward current).
MOVs section did ...
0
votes
2answers
95 views
Can power transformers be used with higher voltages?
I purchased a Japanese transformer for a project I’m doing. It runs on 100VAC, not 120V, something I overlooked. Doing a quick search, Japan seems to use both 50/60Hz, based on the region.
It’s 30 ...
2
votes
2answers
67 views
Will a 300A HV connector fail before a 600A fuse does?
I know this is a silly question but I cannot find ant data indicated it will not. The HV connector rated at 300A @ 85C and it is a 600A fuse, I cannot find a connector with a higher current rating.
...
0
votes
1answer
66 views
MOSFET-switching between two power supplys: how to avoid transverse current?
For a hobby project I would like to switch between two power supplys.
The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
vote
2answers
112 views
Electrical Heater Confusion
I know that a semiconductor material, that is usually used for heaters in variety of application, heat up due to high current, which flows through them or high power dissipation across them.
But lets ...
0
votes
1answer
81 views
Looking for resources for determining cable requirements for high wattage (MW) applications
I'm doing some personal research on the specifications for cables that can handle megawatt power draws. As an example, the wires needed to supply 450VAC @ 2000A (0.9MW). I'm looking for wire diameters ...
0
votes
2answers
237 views
How to limit HV capacitor charging current?
I have a voltage doubler, which is connected to mains (without galvanic isolation):
It enticed me with its simplicity, configurability and option between charging speed or desulfatability.
The ...
6
votes
1answer
266 views
Switch high voltage with triggered spark gap
I want to switch a high current/voltage pulse (up to few 10kV, <1kA) from a capacitor as supply. It needs to be cheap and I don't care about efficiency too much yet.
I took a look at using ...
1
vote
0answers
347 views
Soldering sheet busbars to PCB concerns
Hello fellow engineers
I have decided to solder busbars to a high current pcb , but i have 2 concerns :
Does soldering a flat busbar (shown in left image) could cause thermal stress and deformation ...
0
votes
2answers
129 views
High current/high voltage/high frequency measurement
I have a circuit that I'm having trouble understanding. It measures the current flowing through a conductor. The measured load is 20-100 Amps, 9kHz-34kHz, and approx. 340 volts. The main conductor ...
1
vote
3answers
154 views
Why Does Flyback Current Destroy Darlington Buffered Op-Amp?
I am working on a project where I'd like to deliver variable DC control voltages to a continuous solenoid motor in order to achieve different velocities of actuation.
To buffer my DC control voltage ...
2
votes
2answers
426 views
16A Relay controlled with PWM
I am not very experienced with relays but I need to control the state of a relay with a PWM signal such that if the microcontroller is damaged and the controlling pin gets stuck in a high or low state ...
2
votes
0answers
403 views
TDA7294 100W Audio Amplifier Causing Unexpected Problems
This is the circuit I will be referring in this question:
TDA7294 is described in this data sheet. Upper IC with added external components is a well-known circuit and can be found on many websites ...
1
vote
0answers
154 views
Turn ON/OFF 5V 2-5A by Raspberry Pi GPIO
I need to control few 5V 2-5A devices by rpi GPIOs, which has the 3.3V logic level. I come up with a simple circuit, but I'll appreciate any ideas, corrections, suggestions. The LOAD is something like ...
0
votes
4answers
99 views
Can I provide a constant charge to a battery?
I have a sketch here of what seems like a solid plan. sketch
I need to provide a .2ohm coil around 3.7v which will take around 20 amps. The load will be very brief; 3-5 seconds, and intermittent; ...
1
vote
5answers
714 views
Best way to solder to a relay pin requiring ~30A of current?
On our hot tub circuit board, a trace on the PCB finally got cooked... Quite little damage, actually. The one trace is blackened, and the PCB now has a hole in it, but otherwise, everything looks ...
0
votes
1answer
96 views
Digital switch for 2000V capacitor [closed]
I want to produce a discharge of a capacitor against a test cell, as part of a study on high energy states of materials.
I'm using a standard microwave oven transformer as the power supply that I ...
0
votes
3answers
126 views
Protect power supply from regenerative drive
I am running a 3KW motor on a big 24Vdc power supply (Meanwell RST-5000), through a frequency drive.
When stopping the motor, however, I occasionally get a regenerative backcurrent that trips the ...
